1.

If S_1,S_2 and S_3 are respectively the sums of n, 2n and 3n terms of an A.P, whose first term is a and common difference d, then find S_1,S_2 and S_3

Answer»

SOLUTION :`S_1=n/2[2A+(n-1)d],S_2=n[2a+(2n-1)d],S_3=(3N)/2[2a+(3n-1)d]]


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